I think right now he is studying for exams to try and get into Aoyama University. He's hosting a show on Abema where he does things related to his exam preparation like talking to students who graduated from there (such as Fruit Punch's Murakami). I don't know how often London Hearts airs but I haven't really seen that show in some time either. I don't know for sure about GobuGobu. I am just guessing he may have stepped back from TV a bit to focus on prepping.